Chunks Format

Byte Order

chunks.dat is stored in Little Endian byte order.

Parsing Chunks

Loop the next section 1024 times until you have parsed all chunks.

Header

Name	Size (in bytes)	Description
Chunk Data Size	1	Sector size. In practice this is always 21 (0x15). Multiply this value by 4096.
Chunk Data Location (in 4kb sectors)	3	How many 4kb sectors from the start of the file until the chunk data starts. Multiply this value by 4096.

If Chunk Data Size is greater than 0

Chunk Data

NOTE: Chunks in this version do not store their position and will need to be calculated. Chunks are stored starting at chunk 0,0 and increment in the positive X direction first 32 times then the positive Z direction for a total of a 32×32 chunk area. The game only uses a 16×16 area but the unused chunks are stored still.

Name	Size (in bytes)	Description
A Chunks Block IDs	32,768	A single chunks block ids. Stored in a 3D 8-bit integer array. YZX order (Y increments first)
A Chunks Blocks Data Values	16,384	A single chunks block data values. Stored in a 3D 8-bit integer array. YZX order (Y increments first)
A Chunks Skylight	16,384	A single chunks skylight data. Stored in a 3D 8-bit integer array. YZX order (Y increments first)
A Chunks Blocklight	16,384	A single chunks blocklight data. Stored in a 3D 8-bit integer array. YZX order (Y increments first)
A Chunks Biome IDs	256	A single chunks biome ids. Stored in a 2D 8-bit integer array. ZX order (Z increments first)